Antenna adapter



FIG. 1 is a front, right, top perspective view of the antenna adapter in accordance with the design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a rear elevational view thereof; and,

FIG. 7 is a front elevational view thereof.

The broken lines in FIGS. 1-7, located on the body portion of the antenna adapter, illustrate surface etching, which forms no part of the claimed design. The broken lines in FIGS 1-7 located around the periphery of projections from the body portion, illustrate electrical connection structure of the antenna adapter, which form no part of the claimed design. 

CLAIM The ornamental design for an antenna adapter, as shown and described. 